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Single Bidirectional, Single Unidirectional
Optically Isolated High-Speed I2C Bus Repeaters

Clare's Optically Isolated I2C Bus Repeaters are the industry's first integrated optical solutions for I2C bus design that:

  • Minimize PC board space usage
  • Reduce parts count for this function

Unlike magnetically isolated digital isolator ICs, this optical solution:

  • Needs no internal clocking, which is a primary source of EMI/RFI interference
  • Supports direct static-state buffering without refresh clocks

The CPC5903 features excellent reliability and very long operational life. Contact Clare for available reliability data.

The internal isolation barrier is tested above 6kV peak in the same way that other robust optical devices from Clare have been tested for the past 25 years.

CPC5903

CPC5903 Block Diagram

Data Sheet for CPC5903 (Coming Soon)

Tech Brief - TB-101: Optically Isolating an I2C Interface

Product Brief for the CPC5903


Features:

  • Bidirectionally Buffers I2C SDA Signal
  • Unidirectionally Buffers I2C SCL Signal
  • Glitch-Free Operation
  • Extends and Isolates I2C Interfaces
  • Standard-mode and Fast-mode I2C
    Side B Fast-mode I2C Compliant VDDB=4.5V-5.5V
  • Very Low EM and RF Generation - No Internal Clock
  • SMBus Compatible VDDB=3.3V
  • Operates on 2.7V to 5.5V, Enabling Level Translation
  • Slew-Limited Drivers Reduce EMI
  • Powerdown to Hi-Z Does Not Load I2C
  • 3750Vrms Galvanic Isolation

Applications:

  • Isolated Signal Monitoring and Control
  • Power-over-Ethernet
  • Power Supply High Side Interface
  • I2C Bus Length Extenders
  • I2C Logic Level Translation

 

 
 
 
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